公开(公告)号：US20250067454A1

公开(公告)日：2025-02-27

申请号：US18945143

申请日：2024-11-12

Applicant: Daikin Manufacturing Company, L.P. ,  Daikin Industries, Ltd.

Inventor： Masahiro Honda ,  Junichi Shimoda ,  Takashi Shimamura ,  Yuuji Yamada ,  Hideyuki Nakagawa ,  Hiroyuki Imada ,  David Palazzolo ,  Joseph Kelly Hearnsberger ,  Sriram Venkat ,  Chris Bellshaw ,  John Clements ,  Masahiro Oka ,  Akinori Nakai ,  Cheng Li ,  Takahiro Yamada

IPC: F24F11/46 ,  F24F1/08 ,  F24F1/32 ,  F24F3/06 ,  F24F11/64 ,  F24F11/65 ,  F24F11/80 ,  F24F110/10 ,  F24F110/20 ,  F24F110/22 ,  F24F140/30 ,  F24F140/50 ,  F24F140/60 ,  F24H3/00 ,  F25B13/00 ,  F25B30/02 ,  F25B49/02 ,  G05B19/042

Abstract: An HVAC system is provided. Embodiments of the present disclosure generally relate to an HVAC system in which multiple indoor units are coupled to central outdoor unit, where at least one of the indoor units is configured to provide conditioned air through ductwork and at least one indoor unit is configured to provide conditioned air without ductwork. Moreover, a gas furnace can be provided in the system, for harsher environments that benefit from more robust heating. Additional systems, devices, and methods are also disclosed.

公开(公告)号：US12235027B2

公开(公告)日：2025-02-25

申请号：US17280806

申请日：2019-09-20

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Takuro Yamada ,  Atsushi Yoshimi ,  Eiji Kumakura ,  Ikuhiro Iwata

IPC: F25B45/00 ,  F25B13/00 ,  F25B43/00 ,  F25B49/02 ,  F25B40/00 ,  F25B41/24

Abstract: Efficiency in refrigerant charging work is addressed when a refrigerant recovered from the first heat source unit is to be charged to a second heat source unit. In a refrigerant charging method in which a first heat source unit of an already installed refrigeration cycle apparatus in which a refrigeration cycle is to be performed by a refrigerant that circulates is replaced with a second heat source unit, transferring the refrigerant from the first heat source unit to the second heat source unit is included. In addition, the method includes measuring the weight of the refrigerant that is transferred from the first heat source unit to the second heat source unit.

公开(公告)号：US12228317B2

公开(公告)日：2025-02-18

申请号：US18004034

申请日：2021-11-16

Applicant: HEFEI MIDEA REFRIGERATOR CO., LTD. ,  HEFEI HUALING CO., LTD. ,  MIDEA GROUP CO., LTD.

Inventor： Jindong Wang

IPC: F25B41/20 ,  F25B41/37 ,  F25B47/02 ,  F25B49/02

Abstract: Disclosed are a refrigerator cooling system and a method for defrosting a refrigerator. The refrigerator cooling system includes a refrigerant circulation flow path provided with a compressor, a condenser, a throttling device and an evaporator. The throttling device has a throttling working mode for cooling and a defrosting working mode not used for cooling. The throttling working mode and the defrosting working mode are switched with each other. The condenser has a first heat release mode corresponding to the throttling working mode and a second heat release mode corresponding to the defrosting working mode, and a heat release amount of a refrigerant flowing through the condenser in the second heat release mode is lower than a heat release amount of the refrigerant flowing through the condenser in the first heat release mode.

公开(公告)号：US12215906B2

公开(公告)日：2025-02-04

申请号：US17790618

申请日：2021-03-05

Applicant: DAIKIN INDUSTRIES, LTD. ,  DAIKIN EUROPE N.V.

Inventor： Satoshi Kawano ,  Kevin Cornelis ,  Martijn Deprez

IPC: F25B49/02 ,  F25B13/00 ,  F25B41/20

Abstract: A heat pump system includes a first bypass pipe provided with a first bypass valve and connecting a liquid refrigerant pipe and a low-pressure refrigerant pipe, a refrigerant heat exchanger configured to cause a heat-exchange between refrigerant flowing in the liquid refrigerant pipe and refrigerant flowing in first bypass pipe, a second bypass pipe provided with a second bypass valve and connecting the liquid refrigerant pipe and the low-pressure refrigerant pipe, and a controller. The controller is configured to control opening degree of the first bypass valve based on detected superheated temperature of refrigerant flowing in the first bypass pipe, and detected discharge temperature of a compressor and control opening degree of the second bypass valve based on the detected discharge temperature.

公开(公告)号：US12215905B2

公开(公告)日：2025-02-04

申请号：US17441906

申请日：2020-03-24

Applicant: FUJITSU GENERAL LIMITED

Inventor： Yu Hirosaki ,  Tokihiko Ando ,  Shintaro Sanada ,  Koya Aoki ,  Tatsuro Yamazaki

IPC: F25B49/02 ,  F25B13/00

Abstract: An outdoor unit control unit includes a degree-of-dryness calculating unit that calculates the degree of dryness of a refrigerant flowing into an heat exchanger (an indoor heat exchanger at the time of a cooling operation, and an outdoor heat exchanger at the time of a heating operation) disposed on the downstream side of a liquid pipe, and performs an inhibition mode of inhibiting, when the degree of dryness exceeds a threshold A, control that is performed in the direction of decreasing the degree of opening of the expansion valve (an indoor expansion valve at the time of the cooling operation, and an outdoor expansion valve at the time of the heating operation) disposed on the upstream side of the liquid pipe.

公开(公告)号：US20250035356A1

公开(公告)日：2025-01-30

申请号：US18768607

申请日：2024-07-10

Applicant: Lennox Industries Inc.

Inventor： Shailesh Manohar ,  Eric Berg ,  Umesh Gokhale ,  Vijay Sathyamurthi ,  Daniel Diaz

IPC: F25B49/02

Abstract: A method for performing a pump down cycle to isolate an indoor section of a heating, ventilation, and air conditioning (HVAC) from an indoor section of the HVAC system is disclosed. The method includes transmitting a first control signal to a compressor of the HVAC system. The first control signal causes the compressor to turn on or stay turned on. The method further includes transmitting a second control signal to a vapor line isolation valve. The second control signal causes the vapor line isolation valve to open. The method further includes transmitting a third control signal to a liquid line isolation valve. The third control signal causes the liquid line isolation valve to close. The method further comprises determining that a refrigerant charge in the indoor section has become less than a threshold value. In response, the compressor is turned off and the vapor line isolation valve is closed.

公开(公告)号：US12209782B2

公开(公告)日：2025-01-28

申请号：US17278703

申请日：2019-09-26

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Kiichirou Satou ,  Masataka Nakano

IPC: F25B49/02

Abstract: An abnormality determination device (60) includes a calculator (66) calculating a deviation degree of a compressor (11) from a normal state based on data related to operation of a refrigeration apparatus (1) and a determination unit (62) determining whether the compressor (11) has an abnormality or estimating an abnormality occurrence time based on a calculation result of the calculator (66). The calculator (66) calculates a first index value from data related to operation of the refrigeration apparatus (1) in a first period and a second index value from data related to operation of the refrigeration apparatus (1) in a second period that differs in length from the first period. The calculator (66) calculates the deviation degree of the compressor (11) from the normal state based on the first index value and the second index value. The determination unit (62) determines whether the compressor (11) has an abnormality or estimates an abnormality occurrence time based on the deviation degree of the compressor (11) from the normal state.

公开(公告)号：US12203683B2

公开(公告)日：2025-01-21

申请号：US17128393

申请日：2020-12-21

Applicant: Rheem Manufacturing Company

Inventor： Timothy B. Hawkins ,  Jeremy L. Babb

IPC: F24H4/02 ,  F24D15/04 ,  F24D17/00 ,  F24D17/02 ,  F24D19/10 ,  F24F5/00 ,  F24H4/04 ,  F24H6/00 ,  F24H15/223 ,  F24H15/227 ,  F24H15/254 ,  F24H15/36 ,  F24H15/37 ,  F24H15/39 ,  F24H15/45 ,  F25B5/04 ,  F25B13/00 ,  F25B29/00 ,  F25B41/20 ,  F25B49/02 ,  F28D1/06

Abstract: An apparatus for heating water has a tank for storing water and an air conditioning system that defines a refrigerant flow path through which refrigerant flows. The refrigerant flow path passes through the heat exchanger so that refrigerant heat is contributed to the tank. A control system controls operation of the water heating apparatus.

公开(公告)号：US12196463B2

公开(公告)日：2025-01-14

申请号：US18198776

申请日：2023-05-17

Applicant: KOVA COMFORT, INC.

Inventor： Reza Khatami ,  Richard Zane DeLoach

IPC: F25B41/31 ,  F25B39/02 ,  F25B41/20 ,  F25B41/34 ,  F25B49/02

Abstract: An EXV (electronic expansion valve) control system includes an EXV controller for controlling an EXV within the refrigerant loop of an HVAC system. The EXV controller implements a master control algorithm that includes a plurality of sub-control algorithms and an initial series of branching decision points to determine the current mode of operation and to execute select sub-control algorithms corresponding to the current mode of operation, while not executing the sub-control algorithms corresponding to the other modes of operation. The sub-control algorithms implement various combinations of PID (Proportional Integral Derivative) control and feed-forward control, the results of which can be mapped to specific control instructions for the EXV.

公开(公告)号：US20250015740A1

公开(公告)日：2025-01-09

申请号：US18689621

申请日：2021-11-01

Applicant: Mitsubishi Electric Corporation

Inventor： Shoei TSUTSUMI ,  Shinya TOYODOME ,  Kazunori HATAKEYAMA

IPC: H02P21/20 ,  F25B49/02 ,  H02P21/18 ,  H02P21/22

Abstract: A motor driving device includes an inverter that supplies alternating-current voltage to a motor whose speed is variable due to a load variation caused by a compressor, and a control device. The control device includes a frequency estimation unit estimating a frequency estimation value indicating a rotation of the motor, a speed controlling unit generating a first torque current command value based on a deviation between the frequency estimation value and a frequency command value, a load torque estimation unit estimating a load torque applied to the motor, a compensation value calculation unit calculating a torque current compensation value based on the load torque, where the torque current compensation value causes the motor to accelerate in a period including timing of the maximum load torque, and an adding unit generating a second torque current command value based on the first torque current command and torque current compensation values.